SB Modellbau N Scale Coreless Motor Kit #1034 

For:

Arnold Old Model E03 

and 

Marklin Z-scale 8838 type BR 110 and 139 style BoBo chassis

No instructions are included with the kit, there is a cradle in brass for the coreless Swiss made motor that includes a brass flywheel and worm gears for each axle to sit in after you remove the Marklin motor. The cradle can be glued with instant CA glue of your choice as well as the motor to the cradle, make sure the worm gears align with the gear on the chassis before gluing, two copper wires to solder the power from the chassis to the motor. 

These kits have been sold out for years, and are no longer available, the manufacture of the motors don't sell directly to the consumer anymore.